chore: import upstream snapshot with attribution

tests/extensions/test_agent_context_cli_free.py

@@ -0,0 +1,57 @@
+"""Static guard: the Specify CLI source must contain no agent-context lifecycle code.
+
+The ``agent-context`` extension is a full opt-in and owns its own lifecycle. The
+Python codebase (``src/specify_cli/**``) must therefore not reference any of the
+removed context-section management helpers, the extension config helpers, the
+context markers, or the obsolete deprecation message.
+
+Maps to contract C5 / FR-002 / FR-003 / FR-006 / SC-002 / SC-003.
+"""
+
+from __future__ import annotations
+
+from pathlib import Path
+
+import pytest
+
+PROJECT_ROOT = Path(__file__).resolve().parents[2]
+SRC_ROOT = PROJECT_ROOT / "src" / "specify_cli"
+
+FORBIDDEN_SYMBOLS = [
+    "upsert_context_section",
+    "remove_context_section",
+    "_agent_context_extension_enabled",
+    "_resolve_context_markers",
+    "_resolve_context_files",
+    "_resolve_context_file_values",
+    "_build_context_section",
+    "_AGENT_CTX_EXT_CONFIG",
+    "_load_agent_context_config",
+    "_save_agent_context_config",
+    "_update_agent_context_config_file",
+    "CONTEXT_MARKER_START",
+    "CONTEXT_MARKER_END",
+    "agent-context-config",
+    "agent_context_config",
+    "__CONTEXT_FILE__",
+    "_context_file_display",
+    "Inline agent-context updates",
+    "v0.12.0",
+]
+
+
+@pytest.fixture(scope="module")
+def cli_source_texts() -> list[tuple[str, str]]:
+    """Read every CLI source file once, shared across all parametrized cases."""
+    return [
+        (str(path.relative_to(PROJECT_ROOT)), path.read_text(encoding="utf-8"))
+        for path in SRC_ROOT.rglob("*.py")
+    ]
+
+
+@pytest.mark.parametrize("symbol", FORBIDDEN_SYMBOLS)
+def test_symbol_absent_from_cli_source(symbol, cli_source_texts):
+    offenders = [rel for rel, text in cli_source_texts if symbol in text]
+    assert not offenders, (
+        f"Forbidden agent-context symbol {symbol!r} still present in: {offenders}"
+    )